#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a;
	int b;
	int c;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if ((a + b) > c && (a + c) > b && (b + c) > a)
		{
			if ((a == b) && (b == c))
				printf("Equilateral triangle!");
			else if (((a == b) && (b != c)) || ((a == c) && (b != c)) || ((b == c) && (c != a)))
				printf("Isosceles triangle!\n");
			else
				printf("Ordinary triangle!\n");
		}
		else
			printf("Not a triangle!\n");
	}
		return 0;
}